Connecticut five-digit ZIP codes all begin with 06 and range from 06001 to 06928. All Connecticut zip codes fall between these numbers and include post office boxes (such as 06529), standard ZIP codes (such as 06477) and unique zip codes, which are assigned to single high-volume addresses (such as 06842).
The ZIP code with the highest population density in Connecticut is 06608, which includes the city of Bridgeport. It has a population density of about 12,500 people per square mile. Bridgeport itself is large enough that it encompasses six ZIP codes: 06604, 06605, 06606, 06607, 06608 and 06610. Many other Connecticut cities are also broken up into six ZIP codes, but none are as densely populated as Bridgeport. Other six-ZIP cities include New Haven (encompassing 06519, 06511, 06510, 06513, 06515 and 06504) and Stamford (including 06901, 06906, 06902, 06905 and 06907), both of which also are densely populated areas.
Some of the least-populated areas in Connecticut are Riverton (06065), West Cornwall (06796), West Hartland (06091), Norfolk (06058) and Falls Village (06031). Each of these ZIP codes has a population density of below 50 people per square mile.
Some other Connecticut ZIP codes with high population density include 06269 in Storrs Mansfield, 06053 in New Britain and 06702 in Waterbury.